236 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 9, 



and terminating on the posterior margin. Eyelid tubercular, len- 

 tiferous surface smooth. Wings of moderate size, but not projecting 

 forwards much beyond the eye ; the posterior angles produced into 

 rather short, broad spines. Hypostome almost equal in breadth to 

 the upper part of the glabella above the lateral indentation, rounded 

 at its insertion, and broadly truncate at its extremity. A strong 

 concentric furrow separates the slightly convex anterior portion, which 

 is deeply punctured, and a notch on each side divides it into two lobes, 

 while sculptured lines with a few puncta occur only on the broad 

 outer margin. The thorax has eleven rings, the axis is moderately 

 convex, and not so wide as the glabella ; it becomes gradually narrower 

 towards its posterior part, and is di\^ded by strong axal furrows from 

 the pleurae, which are semicylindrical ; they are bent backwards at 

 about a third of their length ; the terminations of the pleurae are 

 separate, acute, and tubercular beneath. The tail is semi-oval 

 with a spinous border ; its axis convex, not quite equal in width to its 

 lateral parts, and extending two-thirds of the entire length of the 

 tail ; a narrow ridge from its apex connects it with the raised border 

 of the tail ; on its upper part are two distinct rings, and one or two 

 more indistinctly marked. The lateral lobes are flattened. Two 

 narrow and sharply raised ribs arching outwards and ornamented with 

 tubercles are placed on the anterior portion of each side, and produced 

 into short spines extending beyond the raised margin of the caudal 

 shield ; five similar spines occurring on the margin below make up 

 the entire number of nine spines, one of which is terminal. The in- 

 terstices between the ribs, as well as every other part of the animal, 

 are covered with large and small tubercles. 



Variations. — One young specimen (fig. 3. PI. XXVII.) has the 

 margin immediately in front of the indentation with projecting 

 angles almost produced into spines. The lower lateral lobes of fig. 1 . 

 PI. XXVII. are narrower and less tumid than in most specimens, and 

 the forehead lobe is wider in front than is usual. 



2. L. HiRSUTUs, n. sp. Pl. XXVII. figs. 6, 6 «, & 7 ; and 

 Pl. XXVII. bis, figs. 2 & 2 a. 



The body rings (Pl. XXVII. his, fig. 2) are much tuberculated, the 

 axis tapering backwards, pleurae bent backwards, and slightly down- 

 wards, the anterior ones at nearly half, and the posterior at about one- 

 third of their length. Tail semi-oval, not including the six strong 

 spines. Axis subcorneal, extending about two-thirds of the tail, its 

 width about equal to that of the lateral portions, with one strong ring 

 upon the anterior portion and transverse rows of tubercles indicating 

 the position of three or four indistinct rings. A narrow ridge extends 

 from the apex of the axis to the bifurcate extremity. Two lateral ribs 

 on each side, arched shghtly outwards and sharply raised, are produced 

 into thick tubercular spines extending beyond the raised margin. 

 Interstices roughly granular with large tubercles ; small tubercles oc- 

 curring between the large ones and appearing upon the spines of the 

 border. 



From the great similarity in the arrangement of the tubercles upon 



